The answer is 46/7.
First you distribute. So it would be 3x-42. Now add the 1 to the 42. your equation should look like 3x-43=-4x+5. Now add 4x to both sides. 7x-43=5. Now add -43 to both sides. Which is -37. Once you divide (don't ask about the division lol) you should get 46/7.